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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | B.J. Young# | 1.635 | 2042 | |
| 2 | Joey Aragon* | 1.920 | 2013 | |
| 3 | Lynn Lawrence* | 1.932 | 2038 | |
| 4 | Adrian Lee* | 1.960 | 2015 | |
| 5 | Ernesto Mejias* | 2.007 | 2008 | |
| 6 | Rickey Gentry# | 2.022 | 2050 | |
| 7 | Horace Bush# | 2.026 | 2047 | |
| 8 | Bill Black* | 2.036 | 2031 | |
| 9 | Esteban Ramírez* | 2.039 | 2036 | |
| 10 | Esteban Ramírez* | 2.056 | 2039 | |
| 11 | Horace Bush# | 2.061 | 2049 | |
| 12 | Kenny Beasley* | 2.077 | 2031 | |
| 13 | Pablo Ramírez | 2.101 | 2027 | |
| 14 | Esteban Ramírez* | 2.145 | 2038 | |
| 15 | William Stone* | 2.186 | 2018 | |
| 15 | Steven Ramon* | 2.186 | 2014 | |
| 17 | Lou Godfrey* | 2.207 | 2035 | |
| 18 | Joey Aragon* | 2.226 | 2012 | |
| 19 | Milan Clark | 2.229 | 2013 | |
| 20 | Jack Smith* | 2.241 | 2008 | |
| 21 | Bill Black* | 2.276 | 2035 | |
| 22 | Carlos Hernández | 2.278 | 2012 | |
| 23 | Joey Aragon* | 2.281 | 2014 | |
| 24 | Allen Price | 2.289 | 2040 | |
| 25 | Bryan Pickett* | 2.296 | 2024 | |
| 26 | Lou Godfrey* | 2.305 | 2036 | |
| 27 | Brian Hicks# | 2.312 | 2037 | |
| 28 | Todd Brown# | 2.317 | 2048 | |
| 29 | Masaaki Iitsuka | 2.318 | 2039 | |
| 30 | Millard Johnston* | 2.329 | 2025 | |
| 31 | Esteban Ramírez* | 2.331 | 2040 | |
| 32 | Daniel González | 2.342 | 2019 | |
| 33 | Robinson Hill* | 2.348 | 2030 | |
| 34 | Bill Black* | 2.349 | 2032 | |
| 35 | Lou Godfrey* | 2.355 | 2032 | |
| 36 | B.J. Young# | 2.369 | 2047 | |
| 37 | Masaaki Iitsuka | 2.381 | 2038 | |
| 38 | Sergio Torres* | 2.386 | 2018 | |
| 39 | Randy Ryan | 2.391 | 2038 | |
| 40 | Daniel González | 2.398 | 2015 | |
| 41 | José Romano | 2.399 | 2033 | |
| 42 | Yoshihito Kamuta | 2.410 | 2012 | |
| 43 | Pablo Mejía | 2.436 | 2043 | |
| 44 | Brit Clark* | 2.444 | 2035 | |
| 45 | Steven Ramon* | 2.446 | 2013 | |
| 46 | Masaaki Iitsuka | 2.455 | 2040 | |
| 47 | Esteban Ramírez* | 2.458 | 2030 | |
| 48 | Yasunari Kokura | 2.464 | 2037 | |
| 49 | John Crumb* | 2.490 | 2012 | |
| 50 | Ken Russell* | 2.499 | 2031 | |
| 50 | Bill Black* | 2.499 | 2037 | |
| 52 | Fredrick Planas | 2.501 | 2011 | |
| 53 | Lou Godfrey* | 2.508 | 2034 | |
| 54 | Lynn Lawrence* | 2.525 | 2037 | |
| 55 | Adrian Lee* | 2.537 | 2021 | |
| 55 | Todd Brown# | 2.537 | 2050 | |
| 57 | Russ Humby* | 2.540 | 2027 | |
| 58 | Daniel Allen | 2.544 | 2016 | |
| 59 | Alejandro Carapia# | 2.549 | 2051 | |
| 60 | Brian Hicks# | 2.560 | 2047 | |
| 61 | Carl Macconachie | 2.576 | 2015 | |
| 61 | Horace Bush# | 2.576 | 2044 | |
| 63 | Adrian Lee* | 2.582 | 2014 | |
| 64 | Randy Ryan | 2.594 | 2039 | |
| 65 | Brad Heller | 2.598 | 2028 | |
| 66 | Carl Macconachie | 2.606 | 2014 | |
| 67 | B.J. Young# | 2.613 | 2044 | |
| 68 | Matt Hughes* | 2.619 | 2039 | |
| 69 | Matt Hughes* | 2.640 | 2043 | |
| 70 | Kenny Beasley* | 2.643 | 2029 | |
| 70 | Millard Johnston* | 2.643 | 2023 | |
| 72 | Brian Hicks# | 2.644 | 2043 | |
| 73 | Bryan Pickett* | 2.645 | 2027 | |
| 74 | Kenny Beasley* | 2.656 | 2036 | |
| 75 | William Stone* | 2.659 | 2012 | |
| 76 | Esteban Ramírez* | 2.666 | 2034 | |
| 77 | Geoffrey Hodges | 2.669 | 2031 | |
| 78 | Sergio Torres* | 2.670 | 2019 | |
| 79 | Kenny Beasley* | 2.684 | 2039 | |
| 80 | Ernesto Mejias* | 2.685 | 2007 | |
| 81 | Brit Clark* | 2.689 | 2038 | |
| 82 | Yoshihito Kamuta | 2.692 | 2014 | |
| 82 | Russ Humby* | 2.692 | 2025 | |
| 84 | Will Gómez# | 2.696 | 2050 | |
| 85 | Kenny Beasley* | 2.704 | 2041 | |
| 86 | José Saucedo | 2.713 | 2013 | |
| 87 | Todd Brown# | 2.715 | 2044 | |
| 88 | Adrian Lee* | 2.716 | 2017 | |
| 88 | Esteban Ramírez* | 2.716 | 2028 | |
| 90 | Ryan Durango# | 2.717 | 2050 | |
| 90 | Daniel Allen | 2.717 | 2013 | |
| 92 | Pablo Mejía | 2.718 | 2040 | |
| 93 | Kenny Beasley* | 2.725 | 2030 | |
| 94 | Terrence Carter | 2.726 | 2015 | |
| 95 | Telmo Badanha* | 2.731 | 2035 | |
| 96 | Brian Hicks# | 2.732 | 2039 | |
| 97 | Bryan Pickett* | 2.736 | 2025 | |
| 98 | Millard Johnston* | 2.742 | 2017 | |
| 99 | Ken Russell* | 2.744 | 2034 | |
| 100 | Fernando Ortíz | 2.747 | 2036 |
